slug

/slʌɡ/

//slʌɡ// noun

"slug" is a 4-letter English headword indexed on PlainSpell.

The verdict

“slug” has 6 generated spelling variants in the English index at frequency #19,465. The variants make it a useful spelling check.

#19,465
frequency rank, English
6,566
“S” headwords
6
tracked misspellings
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Any of many gastropod mollusks, having no (or only a rudimentary) shell.

Corpus desk

Index EN-slug · slug · English

slug · rank #19,465 · 6 variants · 20 confusables

  • FREQ-MID #19,465
  • LEN-MID 4 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-MID 6 variants
  • BOOK-DENSE 6,566
  • PHOTO-FINISH silhouette

Nearest frequency peer: silhouette (-1 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “slug”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “slug” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

slug vs su
50% similar
slug vs sun
50% similar
slug vs sub
50% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for slug
PropertyValue
Headwordslug
LanguageEnglish
Part of speechNoun
IPA/slʌɡ/
Letters4
Frequency rank#19,465
Misspellings tracked6
Confusable pairs20
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “slug”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).sluglands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “silhouette” (#19,464), “smackdown” (#19,466), “smug” (#19,467). Among 6,566 “S” headwords, “slug” is #19,465. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 6 spelling variants around slug (IPA /slʌɡ/), anoun. Corpus frequency is #19,465 among 6,566 “S” headwords. Wiktionary lists 20 senses, so context still picks the gloss.

Our generated misspelling index lists 6 likely wrong-spelling variants for slug, with forms such as "lsug", "slgu", and "sllug". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 20 confusable-pair relationships, "su", "sun", "sub", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Originally referred to a slow, lazy person, from Middle English slugge (“lazy person", also "sloth, slothfulness”), probably of either Old English or Old Norse origin; perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; slick; sticky… The correct English form is slug, spelled S-L-U-G.

Definition

  1. 1
    Any of many gastropod mollusks, having no (or only a rudimentary) shell.
  2. 2
    A slow, lazy person; a sluggard.
  3. 3
    A bullet or other projectile fired from a firearm; in modern usage, generally refers to a shotgun slug.
  4. 4
    A solid block or piece of roughly shaped metal.
  5. 5
    A counterfeit coin, especially one used to steal from vending machines.
  6. 6
    A shot of a drink, usually alcoholic.
  7. 7
    A title, name or header, a catchline, a short phrase or title to indicate the content of a newspaper or magazine story for editing use.
  8. 8
    The imperial (English) unit of mass that accelerates by 1 foot per second squared (1 ft/s²) when a force of one pound-force (lbf) is exerted on it.
  9. 9
    A discrete mass of a material that moves as a unit, usually through another material.
  10. 10
    A motile pseudoplasmodium formed by amoebae working together.
  11. 11
    An accessory to a diesel-electric locomotive, used to increase adhesive weight and allow full power to be applied at a lower speed. It has trucks with traction motors, but lacks a prime mover, being powered by electricity from the mother locomotive, and may or may not have a control cab.
  12. 12
    A black screen used to separate broadcast items.
  13. 13
    A piece of type metal imprinted by a linotype machine; also a black mark placed in the margin to indicate an error; also said in application to typewriters; type slug.
  14. 14
    A stranger picked up as a passenger to enable legal use of high occupancy vehicle lanes.
  15. 15
    A hitchhiking commuter.
  16. 16
    The last part of a clean URL, the displayed resource name, similar to a filename.
  17. 17
    A hindrance, an obstruction.
  18. 18
    A ship that sails slowly.
  19. 19
    A block of text at the beginning of a scene that sets up the scene's location, characters, etc.
  20. 20
    An infertile egg of a reptile.

Recorded use

Wiktionary examples

These source excerpts show how slug appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. […] all our Ammunition was spent. Those of us who had Money made Slugs of it; their next Shift was to take the middle Screws out of their Guns, and charge their Pieces with them.
  2. A mass accelerator propels a solid metal slug using precisely-controlled electromagnetic attraction and repulsion. The slug is designed to squash or shatter on impact, increasing the energy it transfers to the target. If this were not the case, it would simply punch a hole right through, doing minimal damage.

Etymology

Originally referred to a slow, lazy person, from Middle English slugge (“lazy person", also "sloth, slothfulness”), probably of either Old English or Old Norse origin; perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; slick; sticky; slimy”) or otherwise from the root of Old Norse slókr (“lazy person, oaf”), whence Icelandic slókur (“laziness”). Compare Norn slug (“lazy, slothful, sluggish”), dialectal Norwegian slugg (“a large, heavy body”), sluggje (“heavy, slow person”), Danish slog (“rascal, rogue”). Compare also Dutch slak (“snail, slug”). Doublet of slotch. The sense of a hitchhiking commuter is from the sense of a counterfeit bus token. Bus operators considered sluggers to be cheating as if they were using counterfeit tokens.

Synonyms

nip & Thesaurus:drink

This word in other languages

Common misspellings

Also misspelled as:

  • lsug
  • slgu
  • sllug
  • slugg
  • sslug
  • sulg

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of slug - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

lsug2slgu2sllug1slugg1sslug1sulg2
Edit distance from "slug"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "slug"?
"slug" is spelled S-L-U-G. The IPA pronunciation is /slʌɡ/.
What does "slug" mean?
As a noun, "slug" means: Any of many gastropod mollusks, having no (or only a rudimentary) shell.
What words are commonly confused with "slug"?
"slug" is commonly confused with "su", "sun", "sub". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "slug"?
The IPA (International Phonetic Alphabet) transcription for "slug" is /slʌɡ/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "slug"?
Originally referred to a slow, lazy person, from Middle English slugge (“lazy person", also "sloth, slothfulness”), probably of either Old English or Old Norse origin; perhaps ultimately from Proto-Indo-European *sliǵ-ōn, from *sley- (“smooth; sli... See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "slug", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 4 letters (nearest by frequency rank).

Similar misspelling depth

Headwords with a similar count of attested misspellings (6 here; floor ≥5).

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list